HCD-SHAKE33/SHAKE77
21
SECTION 4
ELECTRICAL CHECK
Procedure:
1. Turn the power on.
2. Input the following signal from Signal Generator to FM
antenna input directly.
Carrier frequency : A = 87.5 MHz, B = 98 MHz, C = 108 MHz
Deviation : 75 kHz
Modulation : 1 kHz
ANT input : 35 dBu (EMF)
Note:
Please use 75 ohm “coaxial cable” to connect SG and the
set. You cannot use video cable for checking.
Please use SG whose output impedance is 75 ohm.
3. Set to FM tuner function and scan the input FM signal with
automatic scanning.
4. Con
fi
rm that input Frequency of A, B and C detected and
automatic scanning stops.
The stop of automatic scanning means “The station signal is
received in good condition”.
FM AUTO STOP CHECK
signal
generator
set
+
–
75
TUNER SECTION
0 dB = 1 V
CD SECTION
[TEST DISC LIST]
Use the following test disc on test mode.
• CD: YEDS-18 (PART No. 3-702-101-01)
or
PATD-012 (PART No. 4-225-203-01)
FOCUS BIAS CHECK
Procedure:
1. Connect the oscilloscope to CN302 pin 17 (RFMON) and
CN302 pin 1 (GND) on the MOTHERBOARD board.
2. Press the [
?/1
] button to turn the power on, and press the [CD]
button to select CD function.
3. Set the test disc (CD: YEDS-18) on the tray and press [
u
]
button to playback.
4. Con
fi
rm that oscilloscope waveform is as shown in the
fi
gure
below (eye pattern).
A good eye pattern means that the diamond shape (
¡
) in the
center of the waveform can be clearly distinguished.
VOLT/DIV: 200 mV
TIME/DIV: 500 ns
level:
1.1 ± 0.25 Vp-p (DVDSL)
1.0 ± 0.25 Vp-p (CD)
Checking Location:
-MOTHERBOARD Board (CONDUCTOR SIDE)-
CN302
pin 1 (GND)
pin 17 (RFMON)
+
–
MOTHERBOARD board
oscilloscope
(DC range)
CN302 pin 17 (RFMON)
CN302 pin 1 (GND)
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